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Group 7 refers to a column on the periodic table containing chemical elements that share similar properties, particularly the halogens (like chlorine and fluorine) which are highly reactive nonmetals. These elements are important in everyday life because they're used in applications ranging from water disinfection to the production of pharmaceuticals and industrial chemicals.
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group 6 ← → group 8
Group 7, numbered by IUPAC nomenclature, is a group of elements in the periodic table. It contains manganese (Mn), technetium (Tc), rhenium (Re) and bohrium (Bh). This group lies in the d-block of the periodic table, and are hence transition metals. This group is sometimes called the manganese group or manganese family after its lightest member; however, the group itself has not acquired a trivial name because it belongs to the broader grouping of the transition metals.